Wire and fiber filled industrial brush wheel



April 4, 1961 R. F. TiLGNER 2,977,621

WIRE AND FIBER FILLED INDUSTRIAL BRUSH WHEEL Filed March 6, 1958 2 Sheets-Sheet 1 INVENTOR.

@406 A r/w/vse 6 A TIDE/Vi) April 4, 1961 TlLGNER 2,977,621

WIRE AND FIBER FILLED INDUSTRIAL BRUSH WHEEL Filed March 6, 1958 2 Sheets-Sheet 2 IN VEN TOR. 24L P605774 64 62 United S e Pam WIRE AND FIBER FILLED INDUSTRIAL BRUSH WHEEL Ralph E. Tilgner, Ellicott City, Md., assign-or to Pittsburgh Plate Glass Company, Allegheny County, Pa., a corporation of Pennsylvania Filed Mar. 6, 1958, Ser. No. 719,541

Claims. (Cl. -182) This invention relates to rotary, power-driven brushes and it has particular relation to brushes of the sectional type which are durable, which run relatively cool during operation and which are inexpensive to construct.

It has heretofore been disclosed to construct brushes comprising one or more annular, disc-like sections strung upon a power-driven arbor or mandrel. The sections often comprise double-ended bristles looped about a ring-like core holding them from radial displacement and being clamped between pairs of parallel-spaced side plates holding them together and giving them their annular disc-like shape. These may be ganged together in any desired number to provide cylindrical brushes.

Various means may be employed to secure the side plates together thus to maintain the double fill material in position. For example, they may be provided teeth struck normally inwardly and being crimped into the bristle stock or the teeth of one disc may be forced through the stock and then through openings in the opposite disc and crimped upon the face of the latter. The teeth in such structures hold the discs together in spaced relationship.

It has also been suggested to form circular channel backing elements adapted to receive doubled material upon a ring-like core. In these annular channel backing elements the sides function as side plates for the discs and the intermediate web portions of the channel integrally interconnect the sides to hold them in clamping engagement with the fill material.

It has also been disclosed to form so-called ring-lock structures comprising fill material doubled about a ringlike core and annular side plates which are held together by a tubular central core having the ends thereof outwardly flanged to engage the side discs or plates thus holding them together in clamping engagement with the fill material.

Advantages of these sectional constructions comprise flexibility of assembly and mounting. For example, brushes of practically any desired length can be assembled by stringing an appropriate number of the sections upon a mandrel or arbor. The brushes may be disassembled at will and the sections reused in other situations. Also, if some of the discs wear out or break down before the others, the defective ones may be replaced with other units without loss of the units which are not defective.

One disadvantage of the sectional constructions comprises relatively high cost of manufacture. This is due to the fact that the sections must be assembled individually by relatively slow techniques, often requiring considerable amounts of manual labor.

Another disadvantage of the sectional constructions resides in the fact that the sections frequently are diflicult to ventilate and if they are heavily loaded in operation, there is a strong tendency for heat build-up therein which may adversely affect the fill material or other parts of the construction.

"ice

Another type of brush which has heretofore enjoyed extensive use is of the so-called spirally-wound, striptype in which a long channel backing element is provided with doubled fill material disposed therein and being looped about and held in place by a filamentary core" corresponding in length to the backing element. These strips comprising the channel backing may be wound to provide cylindrical or tapered brushes or wheels of considerable length. Since the fill material may be assem bled in the channel continuously and with machinery which is automatic or practically automatic in operation, they are, therefore, relatively inexpensive to manu-- facture.

Disadvantages of the spirally-wound structures reside in the fact that failure at any point along the length thereof may result in the failure of an entire brush or wheel. For example, the fill material may be loosened at one point, or a'filamentary core element may fail and under the action of centrifugal force; the entire unit then breaks down at once and cannot be repaired.

The brushes, although they can be wound to various;

lengths, when once formed cannot be modified.

Also, brushes when once formed are fixed in length and it is seldom practicable to provide for use of the construction except for one specific length of mandrel or at least a mandrel comprising specific multiples of V a relatively large unit length.

This invention comprises the provision of a powerthe short spiral bristle portions are so'feathered as sub-' stantially to ccnstitute each spiral an annular disc unit in which all portions of the ends lie in a common plane and that the tips of the channel backings are welded to the side plates.

For the better understanding of the invention, refer-.

ence may now be had to the accompanying drawings in which Fig. l is a side elevational view of a brush section or unit constructed in accordance withthe provisions of this invention.

Fig. 2 is a sectional view substantially upon the line.

Fig. 6 is a sectional view illustrating a mode of teeth,

ering the ends of the spirally-wound bristle portions for purposes of bringing said ends substantially intoa pair of parallel planes.

In Fig. 7 is a fragmentary View illustrating still another mode for planarizing the end portions of the bristleportions.

Fig. 8 is a fragmentary sectional view illustrating a different type of spacer structure for mounting a plurality of sections upon a common mandrel.

Fig. 9 is a side view of a brush formed of sections constructed in accordance with the present invention.

Fig. 10 is a fragment showing the tip of a bristle portion.

In forming a brush section as illustrated in Figs. 1 and 2, short sections of spirally-wound brush strip provide spiral bristle portions 10. Each bristle portion comprises a channel backing 11, spirally-Wound to form a. short cylindrical ring. Channel 11 comprises sides 12 and an intermediate web 13. The fill material indicated at 14 is of the double length type and is looped about filamentary cores 16 of iron, steel or the like disposed within the channel backing element. The fill may be of steel wire, Tampico fibers, nylon filaments, cellulose acetate, or other material.

As illustrated in Fig. 6 of the drawings, the ends of the short spirals are tapered or feathered to wedge shape indicated at 17, whereby the ends of the short cylinder formed by the spiral are substantially planarized, i.e. they lie substantially in spaced parallel planes.

It is possible to form spiral bristle portions of several turns but, in the construction as shown in Fig. 6, the spiral comprises a single full-length turn indicated at 18 and two terminal portions each of which comprises substantially more than a half-turn joined onto the end of the full turn 18. As shown in Fig. 10 small lengths 20 of the channel backing element at the tip thereof are without bristles. This facilitates feathering and welding operations.

Substantial portions of the termini of the two fractional end turns of the spiral perimetrically overlap as indicated at X (see Fig. 6). The taper at 17 and the overlap is such as to assure substantial uniformity of the width W throughout the perimeter of the bristle portion.

In the modification of the bristle portion as illustrated in Fig. 7, it will be apparent that the full spiral turn (or turns) may be provided with an offset portion 22 at an intermediate point (preferably midway of its length). By thus offsetting the intermediate portion of the full turn, depressions are provided as at 23 in which are nested the part turns of the spiral. In this construction it will also be observed that the end portions of the spiral overlap, as at Y, and are feathered as indicated at 24 to follow the slope of the offset, thus to facilitate their fitting within the pockets 23. In this construction, the sums of the part turns of end portions of the spiral are effective to provide a complete turn plus the excess Y providing the feathered or tapered overlapping portions 24. It is thus assured that the bristle portion will be of substantially uniform width around its perimeter. In this construction the length of the tapered portions need not be as great as in the construction shown in Fig. 6 or they may be greater.

The ends of the cores 16 are secured as by gripping between sides 12 of the channel 11 and, if desired, they may be further secured by spot welding as indicated at 26 in Fig. 10. Other methods of securing the cores in the channel backing element of the spiral bristle portion may be employed, if so desired. For example, they could be hooked through openings in the web 13 of the channel.

Means to clamp the turns of the spiral together comprise a pair of side plates 27 which as shown in Fig. 2, have offset or cupped mid-portions providing shoulders 28, upon which the bristle portions are seated. The side plates have chord-like portions 29 clipped or cut out from their outer edges providing arms 30, subtending arcs A, and that function as spaced supports for the turns of the channel backing. Three arms are shown, but two, four or more could be provided, if desired. The intermediate portions in an arc B of the turns are left exposed to the atmosphere which is impelled by rotation of the brush, to flow through the openings formed by the cut out portions at 29.

It will also be apparent that the arms 30 of one section can engage with corresponding arms of a contiguous section when a plurality of sections are mounted upon a mandrel, thus providing a drive between the sections. It will also be observed that the arcs A subtended by the arms are substantially less than the arcs B subtended by the cut out portions 29. This permits air to enter and circulate through the units even through the arms of con.- tiguous units are staggered to provide for intermeshing of the arms. The arms 30 also act as spacers between contiguous units to permit radial outward flow of air about the side of the channel backing elements.

It will be apparent that the end plates of a cylindrical brush or wheel such as is shown in Fig. 9 can be provided with lugs to engage arms 30 on the end sections thus to drive the brush.

The'web 31 constituting the bottom of each cup portion is in contiguity to the bottom of the cup portion of the other side plate and the contiguous portions may be secured together to form a hub for the units, preferably, as by spot welding or by rivets, bolts or the like. Spot welding as indicated at 33, is presently preferred as being the fastest and least expensive method of securing the two elements together.

The tips of the channel backing elements are also welded as at S to the forward edge of the arms 30 firmly to secure the bristle portions in place. The welds hold the tips of the channel backing from axial displacement with respect to the end plates. Spot welds as at S to the other arms are not precluded, though seldom necessary. It is to be noted that the spot welds S are formed near the front edge of the arm. The spot weld at the other end of the channel backing element will be formed near the rear edge of the corresponding arm of the second backing plate.

The margins of each of the sectors constituting arms 30 are radially outwardly turned as indicated at 34 and may, if desired, be crimped over as indicated at 36 upon the outer perimeter of the channel backing element, thus more securely locking the latter in place. The flanges 34, accompanied by the shoulders 28, provide segmental peripheral channels of arc widths A in which the channel backing element is seated and securely held while being adequately cooled by air entering at the cutaway portions 29 in arc B.

As shown in Fig. 2, the inner margins of the srde plates are provided with internal lateral flanges 37 extending coaxially parallel to the axis of the section so that a section along a radius extending through arms 39 is of goblet shape. These flanges may be seated directly upon a mandrel as in Fig. 8, to provide a power-driven construction, but in event the internal diameter of the side plates is larger than the mandrel upon which they are mounted, a suitable adapter may be used for mounting the section and/ or sections. To this end, it will be noted that laterally facing channels 38 formed between the shoulder 28 and flange 37, as shown in Fig. 3 are designed to receive adapter rings 39. Each adapter nng comprises a pair of oppositely laterally facing peripheral corrugations 40 and 41 to provide a radial section approximating the shape of a figure 2 or S. The rings are clipped at their edges as indicated, at C to provide arms 30,, matching arms 30 and the arms of the adapter rings are superposed upon the arms 30.

The corrugation 41 has an inner lateral flange 42 which provides a seat flange adapted to engage the outer perimeter of the supporting mandrel or arbor M. The two corrugations are joined together by shoulder 43. The outer corrugation 40, of the adapter ring provides a bead fitting within the channel 38, thus securing the adapter ring in place. Obviously the corrugation 40 may be secured in channel 38 by spot welding, if so desired. However, this is seldom required because when the sections with the adapters in place, are assembled upon a mandrel and the assembly is clamped, as by end plates (shown in Fig. 9) upon the mandrel, the assembly will be adequately held together without added attachment of the several parts to each other. Lugs L may also optionally be provided on the edges of the arms 36,, looking the latter upon arms 30. These are a mere added safety feature and are not usually required.

It will be apparent that it may sometimes be desirable to provide wider sectional brush units comprising a pair of the sections each of which is constructed as indicated in Figs. 2 and 3 and being assembled as a single-operational unit. One construction of this type is illustrated in Fig. 4, where sections 51 and 52 which are the same as illustrated in Figs. 2 and 3 are disposed in side by side contact with each other to provide a unitrof twice the width illustrated in said Figs. 2 and 3.

The arms 30 of the units may be interlocked as already described to provide a positive drive between them, or they may be disposed in. superposed relationship. Means to hold these sections in assembled relation comprises a pair of clamping plates 53 and 54 which comprise outer arms 56 and 57 engaging and approximating the size and shape of the arms'30 of plates 27 already described. The arms 56 and 57 are offset to provide intermediate shoulder portions 58 engaging the inner perimeters of the flanges 37, thus providing seats for the sections. The clamping plates are further provided with inner annular web portions 59 and 61 having inner lateral peripheral flanges 62 and 63 which provide seats for a tubular inner ring 64 having upset end portions 66 holding the clamping plate from displacement from the core. A tubular spacing ring 67 may be disposed between the annular web portions 59 and 61 to maintain them firmly against the upset portions 66. The tubular ring member 64 in effect provides a grommet within the unit adapted to be mounted upon an appropriate, powerdriven mandrel.

As indicated at 68, portions of the edges of the clamping plates are clipped away at points approximately corresponding in angular position to the clipped portions at 29 of side plates 27, to permit the circulation of air within the units whereby to cool the channel-backing elements of the bristle portions 10.

In the construction as illustrated in Fig. 5, a further modified form of adapter structure is disclosed. This is somewhat similar to that disclosed in Fig. 3 but is so modified as to permit it to be employed for purposes of securing together a pair of sections to operate as a single unit. In this construction, a pair of spaced adapter rings 70 are provided comprising lateral channels 71 formed about the outer perimeters thereof and being adapted to nest in the channels 38 of the individual sections. A second channel 72 disposed intermediate of the width of the ring 78 and oppositely faced with respect to the channel 71 extends under, but is substantially spaced from flange 37 of each of the sections and is further provided with a rim or web 73 of approximately annular form through which extend tubular connecting members 74 which are flanged or swaged as at 75 to secure the ends thereof from displacement. V

The inner edges of the portions 73 are inwardly crimped as at 76 to provide seating surfaces adapted to engage or rest upon a power-driven mandrel 77. It will be recognized that the bottoms of the channel 72 of a ring 20 of a section engage the corresponding portions of the corresponding rings of contiguous sections whereby to receive compressive force exerted against the ends of the brush assembly. It will also be apparent that in event that single sections are employed to form narrow rotary brushes the axial pressure exerted by the end plates of the brushes may be applied against the portions 70.

If desired, portions about the perimeters of the adapter rings 70 may be clipped away as indicated at 78 to provide for the circulation of cooling air within the double units.

If preferred, the outer perimeters of the adapter rings analogous to, rings 39, but being of proper size, may be seated directly within the inner flanges 37 of the side plates 27 as indicated in broken line at Z in Fig. 2. Clipped portions corresponding to C in Fig. 3 are not then required to maintain ventilation. The adapters may then have continuous circular perimeters.

A cylindrical brush or wheel comprising a series of sectional units, such as is illustrated in Figs. 1 through 7 is shown in Fig. 9. Such assembly comprises a mandrel 79 having an appropriate number of sectional units U strung thereupon. The mandrel has bearing portions 81 and 82 designed to run in bearings (not shown) in well-known manner. At one end, the mandrel is provided with a face,

or end plate 83 appropriately rigidly mounted. This plate' may have lugs or pins as at 84 designed to engage and drive the contiguous side plate of the first section The other sections may be driven from this first section or by suitable keyway and key connections to the mandrel. The adapter rings within the sections, such as illustrated in Figs. 3, 4 and 5, may be pressed against those of contiguous sections with but little or no compression on the bristle portions, by an end plate 86 actuated by a nut 87 threaded upon the mandrel as at 88.

If desired, the side plates 27 of basic sections may be proportioned to seat directly upon certain sizes of mandrel without recourse to adapter rings. Such construction is illustrated in Fig. 8. In this embodiment, the inner flanges 37 engage the mandrel 90. Flanges 37 of adjacent sections may be separated by spacer rings 91 which preferably are cylindrical and fit fairly snugly upon the mandrel. The rings 91 are proportioned to take the thrust exerted by tightening of the end plates of an assembly with but little compression upon the bristle portions. Flanges 37 may also be of suflicicnt width to obviate the necessity of spacer rings as compression-bearing members.

If preferred, the web portions 31 of the side plates may be formed without internal flanges 37 and with central openings no larger than the minimum size mandrel to which the sections may be applied. If it is desired to apply the sections to larger sizes of mandrel, the central openings may then be bored or reamed to size. By selecting suitable spacer rings 91, a standard size of sections may be adapted to a wide range of different sizes of mandrelat small cost.

It has been suggested in connection with the structures comprising adapters as in Figs. 3, 4 and 5 or in Fig. 8, that the axial pressure exerted by tightening of the end plates be taken by the adapter rings or throughthe spacer rings and flanges 37, with but little or no axial pressure through arms 30 and the turns of channel backing elements 11. This is not always necessary or even desirable. It may be desirable in some instances, to transmit the pressure of the end plates of the brush wheel directly through said arms and said channel backing elements. Such pressure may be of assistance in the attainment of a tight grip upon the fill material in the channel.

The brush sections herein shown can be assembled from stampings made in a press in well-known manner. The spiral bristle portions can be cut from a long spiral or short lengths of straight strip can be wound to spiral form. The ends of the strip may be feathered by pressing or by a hammering operation. The spot welds at the ends of bristle portion and between the end plates can be obtained with conventional spot welders.

The forms of the invention herein disclosed are by way of illustration. It will be evident that many modifications may be made therein without departure from the spirit of the invention or the scope of the appended claims.

I claim:

1. A rotary brush section comprising a length of a spirally wound channel backing strip having bristles secured therein, the turns of the spirally wound backing strip providing a short cylinder, said cylinder comprising a midportion having at least one full spiral turn and fractional end turns upon said mid-portion, the tips of said fractional end turns being feathered and the feathered portion at one end of the channel backing strip being perimetrically overlapped with respect to the feathered portion upon the other end of the cylinder, whereby to planarize the ends of the cylinder and to bring the planarized ends 7 into substantially parallel relationship with respect to each other, and side plates for the brush section being formed rectly secured to the inner faces of the side platespby means locking the plates from axial displacement with respect to the ends of the cylinder, and the side plates further having cupped central portions in opposed relationship with respect to each other and providing a hub for the brush section.

2. A rotary brush section comprising a spirally-wound channel backing strip having bristles secured therein, said spirally-wound channel backing strip comprising a midportion having at least one full turn and fractional end turns upon said mid-portion, the tips of the fractional end turns being feathered and the feathered portions perimetrically overlapping each other, whereby the ends of the cylinder formed by the spiral lie substantially in spaced parallel planes, side plates upon the ends of the cylinder formed by the spiral, the tips of the spirally-wound channel backing strip being directly welded to the side plates, the side plates having central openings formed therein adapted to seat upon a mandrel and further having opposed cuppcd mid-portions thereof in contiguity to each other and the cupped portions being rigidly secured together.

3. A rotary brush section comprising spirally-wound channel backing strip, said strip having a filamentary metallic core disposed longitudinally therein and double length bristles looped thereabout, the strip comprising a mid-portion containing at least one full turn and fractional end turns upon said mid-portion, the tips of the end portions being feathered and the feathered portions being perimetrically overlapped so that the cylinder formed by the spiral formed by said backing strip is of substantially uniform longitudinal width around its perimeter, the sides of the strip being crimped together at their tips to grip the core, the core and the crimped portions being welded together, and side plates upon the ends of the cylinder, the ends of the spirally-wound backing strip being welded to the side plates and the side plates being welded together.

4. A rotary brush comprising a spirally-wound, channel backing element having radially extending bristles secured therein, the mid-portions of the backing element comprising at least one full turn having end portions extending therefrom which are less than full turns and greater than half turns the end portions being feathered and the feathered portions being perimetrically overlapped whereby the ends of the cylinder formed by the spiral lie approximately in spaced parallel planes, a pair of side Plates upon the cylinder having rim portions, the tips of the channel backing element being spot welded to the rim portions of said side plates, said side plates having portions clipped from the rim portions, leaving portions of the spiral exposed for cooling, and having web portions oppositely cupping and in contact with each other, and being secured together.

5. A rotary brush comprising a spirally-wound, channel backing strip having radially extending bristles secured therein, the mid-portion of the backing strip comprising at least one full turn and terminating in end portions which are less than full turns and greater than half turns the end portions being feathered and perimetrically overlapped whereby the ends of the cylinder formed by the spiral lie approximately in spaced parallel planes, side plates upon the ends of the cylinder, the tips of the channel backing strip being spot welded to the side plates the side plates being oppositely cupped into contiguity to each other and spot welded together to provide channels adapted to retain said spirally-wound backing strip.

6. A substantially annular brush section comprising a continuously spirally-wound channel backing strip form ing a cylinder and having bristles secured therein and projecting therefrom to provide a spirally-wound brush portion the ends of the spirally-wound backing strip being feathered and perimetrically overlapped, whereby the ends of the cylinder are disposed substantially in spaced, approximately parallel planes, side plates with central openings formed therein, disposed coaxially upon the ends of the cylinder, said plates having oppositely offset portions and being concentric with the spiral and form ing seats for the spiral, the ends of the backing element being welded to the side plates, the portions of the plates within the circle of the offset portions being welded together to form said sections.

7. A substantially annular brush unit comprising a pair of annular brush sections each comprising a spirally-wound channel backing strip which forms a cylinder and having bristles secured therein and projecting substantially radially therefrom to provide a brush portion, the ends of said channel backing strip being feathered and perimetrically overlapped whereby the ends of the cylinder are disposed substantially completely in spaced approximately parallel planes, annular side plates disposed coaxially upon the ends of each of the cylinders, the side plates having oppositely, but coaxially offset portions to provide channel portions having approximately radially outwardly flared rim portions and juxtaposed webs, the ends of said backing strip being spot welded to said rims, said webs being rigidly secured together and an adapter structure disposed within said sections for mounting the same as a unit upon a power-driven mandrel and comprising a pair of rings adapted to seat upon a power-driven mandrel, each ring comprising a pair of oppositely outwardly but coaxially facing channels having backs engaging said webs and said offset portions.

8. A brush comprising a pair of sections, each of which comprises a spirally-wound channel backing strip forming a short cylinder and bristles secured in said strip, a pair of side plates for each of said sections and having central openings, said sections being disposed in side by side relationship, an adapter structure disposed in the sections comprising a pair of rings each comprising outer arms and a substantially annular inner portion joined to the arms by interconnecting offset portions, the latter portions being adapted to seat within the inner perimeter of the sections, the inner perimeter of the inner portion of each of said rings being adapted to seat upon a mandrel and the outer arm portions being disposed to engage a face of a side plate of one section and means between the inner portions of the two adapter rings to hold them in space relationship and comprising a coaxially disposed cylindrical spacer ring, and means to hold the latter-mentioned portions against the ends of the spacer ring and comprising an inner grommet within said latter-mentioned portions, adapted to seat upon a mandrel and having the ends thereof flared to engage and hold said latter-mentioned portions.

9. A substantially annular brush unit comprising a pair of annular brush sections, each comprising a spirallywound channel backing strip forming a cylinder and having bristles secured therein and projecting substantially radially therefrom to provide a brush portion, the ends of said channel backing strip being feathered and perimetrically overlapped whereby the ends of the cylinder are disposed substantially completely in spaced approximately parallel planes, annular side plates disposed coaxially upon the ends of the cylinder, the side plates having oppositely, but coaxially offset portions to provide channel portions having approximately radially outwardly flared rim portions and juxtaposed webs, the ends of said backing element being spot welded to the sides of the rims, said webs being rigidly secured together and an adapter structure disposed within said sections for mounting the same as a unit upon a power-driven mandrel and comprising a pair of rings adapted to seat upon a power-driven mandrel, each ring having a coaxially facing channel having a back engaging said web and said offset portions, said rings further comprising radially inwardly extending webs and connections between the latter holding the rings together.

10. A brush section comprising a brush portion which comprises a spirally-wound channel backing strip forming a short cylinder, radially disposed bristles secured in 9 the strip, said strip comprising a mid-portion containing one full turn and partial end turns the sums of which are greater than a full circle, the end turns being feathered and perimetrically overlapped to planarize the faces of the section, a pair of coaxially disposed side plates having a central opening and having laterally directed inner flanges adapted for mounting upon a mandrel the edges of the plates being cut to provide spaced arms, the arms of one plate being paired with those of the other, the web portions of the two plates being secured together, the arms in each pair being spread to provide channels in which the spirally-wound channel backing strip is gripped, one end of said channel backing strip being welded to the front edge of one arm of a pair and the other end being welded to the rear edge of the second arm of the pair.

References Cited in the file of this patent UNITED STATES PATENTS 1,152,180 Jarvis Aug. 31, 1915 2,000,612 Radinse May 7, 1935 2,316,185 Peterson Apr. 13, 1943 2,324,272 Anderson July 13, 1943 2,609,559 Peterson Sept. 9, 1952 2,824,327 Van Chief Feb. 25, 1958 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 2,977,621 April 4, 1961 Ralph F. Tilgner It is hereby certified that error appears in the above numbered patentrequiring correction and that the said Letters Patent should read as "corrected below.

Column 3, line 74, for "through" read though column 10, line 12, for "Van Chief" read Van Cllef Signed and sealed this 13th day of February 1962. v

(SEAL) Attest:

ERNEST W. SWIDER DAVID L. LADD Attesting Officer Commissioner of Patents 

